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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '642063b90e82b088e7b2b75285123b10f1fc5d58ef11d6cbcc00b0ee7cc14480' 
  AND token = 'lUyev/Afi68eMyai6GE0C76s7AMjlDUX713OGH/kKUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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