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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87628e29c2b5f2ee046cdaa32c3dd59c8cdea45fee6986d700e3506b9fb98c03' 
  AND token = 'aKli3dTTG4T0UYjrLv++TNETmcYIH5u00C77oc9Su4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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