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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713b9aedf5cc10d15e75e3cbb2b1e65179adb1496155626cc89ac8a872935325' 
  AND token = 'K0quhJiopcc0EdMpP3+5FlbM1i9VtzGRKD+tw4OKdXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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