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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83eac3f0c8961c26942c339a301780b938199b416fcdb0250b92a4687c01283d' 
  AND token = 'nB7p0ETGig6AtqsQN8z5DRUijog24qnUQHCCMrtvn70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}