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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b61af7a2cf015aff2bc7a65eb11ab325778fdd4857f7b8a1bede0d7cd1e169b' 
  AND token = 'VWkWn9YVn1Jj4iueYCyKO/RY09bRNyplz5eI3zKMPDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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