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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1045d3d7478f47aba5f4f040f1e8fa2a608a7ecad2d16e2fa85448bf4f2aeaae' 
  AND token = 'eUOME+n0Vok/o2rJ674aj54+AXFZhZX1WAM80cpRARM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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