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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d60a1113d54d3bf9610ff0c35720adb1b61c62d06fbda416efe11d6e14bddb' 
  AND token = 'cpBbROmYa0tt+sg4urALsv07eQMmkyjfAcneCWq06f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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