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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054d4dc9beb1526ca01228d6f56cdcdc0a3d4ea470e83a47496d0541c2672d8c' 
  AND token = 'fAlgX48/JsKqYeQn/W3j3Ky1ExHlp3nF6dQ6AesL8yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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