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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a0cd702c5a1aa8176ee6ed3f3b8bd09403364ff0a755feb571e882e268ce1b' 
  AND token = 'EA0XkwR8Tef7RINNOb68+jZ31izRMYZlZDpxWxI9WI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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