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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd87c5883af00282b24bf8d1615200ad13483ace2f8b969e4659cc7c6119749' 
  AND token = 'rgU1uWQwpPBj4htnT0LoooHUo50yIIyWNFBQ1hD/Zyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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