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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5adbaa21b75e19ae45459945ec84e2b71535d75dcc29486e1cfc99727ac6826' 
  AND token = 'KfSHa1v70nWvCSaVwCPr0bPw/LgAl+5JzhDNLsn6rBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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