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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d0b5bd67047fe17037e5ac0a92ccce9d08f3119f9028b8a69b8719268a65fc' 
  AND token = 'EKhtvrLkxE32OwlJlR+xEvm5yGe6poYbo1Onu19mUlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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