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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc80b92af41ff4684f7a17604fd08448cf4492c7e6736486524a8d4b2b846209' 
  AND token = '0q/huLODewW759Oxj2zlKRaq9wlZsS3iTWr61pwab38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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