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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938b1fb626c44bc7a88437ade2199455940075901f0bdf5746f2537a6a173cf3' 
  AND token = 'frzrKAMI5kxSNlm/KpA74np8KZS3HxVMoFnMsU1KErQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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