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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3b1f2b3b985cf2820341f7e1f04d0e8ed360a333f544450c3f054767385757f' 
  AND token = 's+aS/BU5ZXg4Vv7IDzrGEoOeowlVOnffGb3S0D+XYWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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