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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47d4568fb8d81f3fdae5d2462181de07113a12fe230ad74d7d04fb745bb8958' 
  AND token = '2tJA4/hukw0fTrfupLU0r2JteE3AFz/elousGmsEX98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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