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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae754410af27dc9ce064d77a6145b488770ad8250bc82d714e4591d5944f9e3' 
  AND token = 'dO3wEV9mP+bRaaM6fM2ZlV8s7uucCsecTf+DoNCwCrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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