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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474c30a6bb8ea1e60f96d0581f393c041fc20064f3c38342af9dfb509e434d6a' 
  AND token = '+07edqZqLRpbJnPAnkA5cr+CUmY/+0j826cdjAlqy2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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