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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd481b07246c10203474f8e37abbf4dfeba35840b0aba100f9cf775b49bdc986d' 
  AND token = 'BlXAB0NGdqBijaoznSCqyrg4BDk7AIc1BRDG/elUMIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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