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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75e344918aff32f55481e70f566533cb975635bf5c985ec5952dab3996dc3462' 
  AND token = 'V5cv6hqDvStS959wi61CGH6WW782ilW9Y7WNPsxByq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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