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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea680a0c288911306439fec033f8cf4150a395c6fdd719a4aa6f724d9f26329' 
  AND token = 'v/Nwmnp5ysswZs5gEcNb29SjDg8d1xnfvINhLX6d+LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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