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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a28319a82ee71512690f3ca26c1b15a6d5de5b1cae447f820904ad98d1e6eb' 
  AND token = 'HMcxQbkfZTPVWalbbq8TO+qAYNjyPh7P7EK3qGOULTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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