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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e2a848ea30d9c0c15345844c5ce4f0304d16e916b0c6383fc16ed8cbbd975a' 
  AND token = 'okHn5AeBa1jfe3nNdvuNqXZ5HkG1e4UdYjQa52491kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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