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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19082f914a179faa805f7181fea5bf78bddb6108a67f26885db480ee8c38d1bb' 
  AND token = 'wXq8JU1+UEcamTUml0VVRpRatAIJ176H8hwOdeoCI3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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