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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6281551795c564f49cbc9cf41e004f7784a233cfbe95393682803a130d698f4b' 
  AND token = 'cjQs19IpmVq4/irJ6E9SV2zqJEh9AuSE0D5eh0eCocE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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