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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7581c0493b4c3a731639c56bd1aedc6b017b77cf6c7ca3e48ff1191a987cd4d' 
  AND token = '/IHeqfm9qCFMVv8TAADYl0RMQRinZqTJuNwbV+2tToQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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