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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608dceaa0e41bbbfb0d4785e88d7dc4baf31a2103a67e082ea9f89f2b614bdad' 
  AND token = '6NOmsX9fIy5oe9fi18SI9CKbB5O6+axnyDZ2s+j5Pg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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