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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9bcd293eb48f2ad7970e15fd35922875c8ad9f249f427b86f0a1c26794ecc0' 
  AND token = 'j9t7Pys0TzFHNQQbrrW68V2OLf+Bz/CCvnY2PWSMy8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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