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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268b91ff624283883f78505bae764578afd968ed2a1fc30063be28369adb686a' 
  AND token = 'GTHT3QZy1XQGjOlfcXtxD9g1m7Svt27K+1Flh1Ul97k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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