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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1efd3472fe04dcb3f8ffc11665fbe60c4bdda6cf83f6b27802d215484be6ca' 
  AND token = '4o1n+kP1r+uY7Rx29P0ExVBiPW0FSgVjbXzpkFWeLu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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