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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77310f9533cb4191d587bad3be5cb1d6f0489c6d95a59bcacd8b341169feb73a' 
  AND token = 'Tr5uVoK8b2YAYs8yOt9Ke7rGdh2Er9wAshOTOJjMTvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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