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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff3798a5357f32e58313813fe9094c1b3275b34a800585ef7c67e59b6778855' 
  AND token = 'wdDeo6D18o5scL+AJLJsvCDxENY/4CfzUqqmiHrUgPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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