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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe957c7b5466a11519f73a9b0f27fd80431b02f36a028adb697a9eaf2f877c7' 
  AND token = 'xbxUeOnJ0U/t5HGKBCx7+OmJ72L3hB3UJT5eo6RY1ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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