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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0fd145f1bc084cf12ff01cc0cf2e012b8614c2588c3ca139d78b973bd97775' 
  AND token = 'ecog04/JxzzLi0uRDMVcKWXLGycesOqg9NFB3jNLxk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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