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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e4f9d5b8b4a5c9482f4c9891b1e25877f6029c092d4b330c0c1e4de9bec750' 
  AND token = 'YCQZFo+L1c31ZUN+2k2C6j5qcHelGKnahE8L44Muyfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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