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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3ae2e1a12d74f5dc49607d755f0413733f6dbf8bb8b28476a0d02647c90c8b' 
  AND token = 'N4ncDV5NRjY/AdaA+Xor5P2DN89HE/KmSOHKLdAbzcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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