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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e4ff55c6a977a2167232aa145edb451f1d2f56e742fea34d349961e6ffe508' 
  AND token = '75oq8a3gXMbhwdMZeQVnSFG6hHgEY//4+8Ng1lTZ72w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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