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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2518a153ae13d9917bd7729249498a0f3425396a6a1335bd35ade20a42825bb4' 
  AND token = '2orEf+9kDmYADVkT2Fakwiv9v/vc00CLXL/wG6NKrH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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