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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938d1d4b63d754444f5a9e5c99db2ff1aaabc07b6a26e866db6f8349d4982321' 
  AND token = 'BsapL4dwZi4UrJhp3MwyGfXkpdycVOYxSfXpQTGLAG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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