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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5144a9c7f368668de8739a4fdef34ea9ae0dc39b02e2f81b260882d982daec7' 
  AND token = 'rUQImw2hPTe1zJcxjZeTvhtav86qG3RNnRbUW6ucWHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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