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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ae27a3ae5c2f955959013b3cbdb6393652007000a42201ab77d6bd2929f78c' 
  AND token = 'SyZQOI+z5aHv9g889c2cKE+Cqz3pjB+1ExZeGz5vp8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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