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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b2ff95cc2651e80416ed11ab4a06ca18e3e8cd16409185d4810b1999113bc9' 
  AND token = 'mzOQC9ww8ggLLv2zNnOP39595dCMNZf6Iwvm9THD93s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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