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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70c337b7f46d1ed037db2f00cc510ab463d34eae7c4af7c3feb3ead3bc5880c' 
  AND token = 'SY9rxTiNbjfLCBj1lnCJO8U30nRh4Ijei4NMT/1zIRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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