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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdcbfb295c05bc74ef8e737ece1131b6782db4e4a869e430a29a3f0300d98243' 
  AND token = 'pwzUcjO+Egc9YGH3ulaKf1+EKQ59mDoa11wVV2W9mN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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