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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de98047a493899253e5ea58d22214cd5f638acd93fb77b8e6e1a0ab1411dfb28' 
  AND token = 'R0F8BM4Xzm6ocZ8HRADRwyV8twnMaGrYLms6ks8JGX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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