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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017493ffcada2fce23e69b4b3e9815d7a6c8f868a810f23bf3ae96199c96ef45' 
  AND token = 'E0FzMc+DOe6W/4qR3H48FYLj1yxBTcMQkbuajI9dtpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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