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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1d1c0edab850b6a7c8dfb39b83b06fb7f0f931bf6c68ddfed19217304c5bef' 
  AND token = '8+BTSku1fJQySqDkP3QemEhN3CsBcw26ruThj2aPdEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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