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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac3429aee8577fd4fdc8e5fe9dbbdd2dba13462aac9cd86294b30980eb55375b' 
  AND token = 'XzhH+KASMvjVp7Hp4uR5A78d93zj80leD4V3R7urBjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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