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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88ecf52807ed0e3361a2d4311beeb27772ad9fc2deff0588db86f800073c5cc' 
  AND token = 'IzkKC30Cp6WPM5Z6FbfREU5ScY9hY3Ltq81vrDRShco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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