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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa2072d6d6b3107fa3d6a89f3e2d0e9f48a799319f51e5cd3c907e95560dad66' 
  AND token = 'jXXNjoYpcTkoMr6Tj9COsTuKa9t2EQV1svSoRwINbbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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