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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9cd59c59a60033b152fbad9d65d34da6793b97cfae1ea22a357febc54190da' 
  AND token = 'MmG0IKGQGid0R6pLcv+VuAtrLjcOi2c9tyRgAX5QKRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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