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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e7db332a3d763f1cea646f03a7ca151fa5f5cae031508670c39bd30d44dd042' 
  AND token = '1i+FkgHiSQelnD3F7O8gzQ6J9DLCiy0MW5TM1BK7jBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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