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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05ee9165e16c733e9925a67832c3c3df9b3448cd4c3caeacbe6a3efbe0a03bd' 
  AND token = 'M0U49R6Ak+LqWqiSLyQsEUJSTiakkBuE2sUFtQeopkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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