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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3037d6ae4ada506731b10af81e29ddda88c7f23baaf3b8229cb5eb72a585e251' 
  AND token = 'lnyfdR268uHkJGHIHNnsieTCz5z1nNReuRVt43z1e1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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